There are many types of sensors used in automation and robotics. Gas sensors, light sensors, touch and motion sensors – these are just some of the types, probably the most popular ones. However, one of the most interesting modules extending a given project with a number of new functions are reflection sensors.
Sharp GP2Y0A02YK0F - Analog distance sensor 20-150 cm - Pololu 1137
Index: PLL-00073
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DFRobot qualMeter Basic - power supply/charger and USB cable tester
Index: DFR-10166
- Reduced price
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Converter VGA - DVI-D 24 + 1 pin with cable 15cm - Akyga AK-AD-50
Index: RCO-14908
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Sensors odbiciowe
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KTIR0711S reflective optocoupler sensor - 5pcs
Reflective optocoupler used, for example, to distinguish the edges. The system is closed in a small, surface soldered case with dimensions: 2.7 x 3.4 mm. Items are sold in...
Index: UCC-00053
Index: UCC-00053
TCST1103 photoelectric sensor - optocoupler
Slit width: 3 mm. Maximum voltage - 70 Volts .
Index: UCC-00372
Index: UCC-00372
Module with reflective sensor KTIR0711S powered with the voltage of up to 5 V. It is characterized by small dimensions : 9 x 14 mm .
Index: MOD-00918
Index: MOD-00918
Distance sensor, reflective 3,3V/5V - 30mm - Waveshare 9523
The reflective module with IR sensor equipped with digital and analog output. It works with a voltage from 3 V to 5.3 V. It enbales the detection of obstacles in the range from...
Index: WSR-04459
Index: WSR-04459
Reflectance sensor KTIR0711S - with connectors
Module with reflective sensor KTIR0711S powered with the voltage of up to 5 V. It is characterized by small dimensions: 9 x 14 mm. It has soldered goldpin connectors.
Index: MOD-01744
Index: MOD-01744
Photo Interrupter Sensor, Speed Measuring - Waveshare 12225
Digital module with optical sensor, with a gap of 6 mm. The module has a built-in comparator, because of this, the output is a digital signal. Supply voltage is from 3.3 V to 5...
Index: WSR-08834
Index: WSR-08834
Reflector for photoelectric sensor 6x4cm
Reflector for photoelectric sensors. The size of the refelector - 40 x 60 x 8 mm.
Index: AKS-10611
Index: AKS-10611
Trim with QTR-3RC reflective sensors - digital - Pololu 2457
Compact bar with three reflective sensors with the size of 32 x 8 mm. It has analog outputs, it is powered with the voltage of 5 V.
Index: PLL-01731
Index: PLL-01731
Photocell for gates - sensors IR
The kit includes: the transmitter and receiver of infrared radiation. Together they create an invisible barrier, which when crossed by a person, an animal or a vehicle, will...
Index: LED-07174
Index: LED-07174
DFRobot Gravity - line tracking sensor - reflective, digital
Digital sensor of tracking the line, reflective for Arduino, it can detect the white and black lines. Separate signals provides a stable output signal TTL, so it looks for more...
Index: DFR-11273
Index: DFR-11273
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QTR-8RC reflectance sensor array - digital - Pololu 961
Strap with eight reflective sensors with digital output. It is powered with the voltage of 5 V or 3.3 V.
Index: PLL-00020
Index: PLL-00020
QTR-1A reflectance sensor - 2pcs. - Pololu 2458
Two modules with QTR reflective sensors. They have an analog output. The supply voltage is 5 V.
Index: PLL-01842
Index: PLL-01842
Photocell - IR beam interruption sensors
The kit includes: the transmitter and receiver of infrared radiation. Together they create an invisible barrier, which when crossed by a person, an animal or a vehicle, will...
Index: LED-05369
Index: LED-05369
Photoelectric sensor NPN E3Z-R61 12-24V IP67 - 4m - cable length 2m
The photoelectric sensor detects objects using the method of reflections from the reflector, with the function of MSR. The detection range is from 0.1 m to 4 m. It has two...
Index: AKS-10608
Index: AKS-10608
VCNL4010 - distance and light sensor 20cm I2C - Adafruit 466
A digital sensor measuring the distance ranging up to 20 cm and the intensity of the incident light. It communicates via the I2C bus (TWi), it works with a voltage of 3.3 V and...
Index: ADA-04969
Index: ADA-04969
QTR-8A reflectance sensor array- analog - Pololu 960
Strap of the eight reflecting sensors with analog outputs. It is powered with the voltage of 5 V or 3.3 V.
Index: PLL-00152
Index: PLL-00152
Trim with QTR-3A reflective sensors - analog - Pololu 2456
Compact bar with three reflective sensors with the size of 32 x 8 mm. It has analog outputs, it is powered with the voltage of 5 V.
Index: PLL-01730
Index: PLL-01730
Distance sensor, reflective 3,3V/5V - Iduino ST1140
The module is equipped with IR reflective sensor equipped with digital output. It works with a supply voltage from 3.3 V to 5 V. It is applied in the robots tracking the line.
Index: OST-14274
Index: OST-14274
Grove - RS-06WD reflectance sensor v1.1
Module from the Grove is equipped with the reflective sensor RS-06WD. It consists of LED emitting the infrared light and phototransistor of high sensitivity. It is supplied...
Index: SEE-11331
Index: SEE-11331
Distance sensor, reflective - receiver + transmiter IR - 3.3V / 5V - 40cm - Iduino ST1081
The reflective module with a transmitter and an infrared receiver, equipped with a digital output. It works with a voltage from 3.3 V to 5 V. It enables the detection of...
Index: OST-14256
Index: OST-14256
Reflectance sensorQTR-L-1A - analog (2 pcs) - Pololu 2454
Module with reflective sensor basing on the transmitting LED and phototransistor operating in the infrared range. The sensor is powered with the 5V voltage. The output is an...
Index: PLL-01406
Index: PLL-01406
QRE1113 - analog reflectance sensor - SparkFun ROB-09453
Analog sensor that has capability of detecting the line. Detects light reflected from the surface and on its basis determines the color of the surface. The module has an analog...
Index: SPF-07684
Index: SPF-07684
Photoelectric sensor SPDT E3JK-R4M1 12V IP65 - 4m
Photoelectric transmitting sensor. It detects the objects by the method of reflection. Detection range is up to 4 meters. It has Light-ON operation mode. It is powered with...
Index: AKS-10610
Index: AKS-10610
The reflection sensor is a device that can be found in thousands of robotic projects, especially the more advanced ones. Line followers are a good example. The task of such a robot is to follow a path in accordance with the course of a line drawn on the surface. Typically, line followers fall into two categories: devices that follow a white line on a black background in reverse, i.e. devices that follow a black line on a white background. In order for the robot to be able to properly follow its path, it must be equipped with appropriate equipment. Such a device - apart from power supply and drive, microcontrollers and a processor - is the reflection sensor. Reflective sensors effectively warn of potential obstacles on the track. See all products available in this category. Choose the highest quality sensors that meet your needs now.
The principle of operation of reflection sensors
Reflective sensors can be used both for Internet of Things projects and for building your own robots. There are many types of these devices. How do reflection sensors work?
In general, it can be said that reflection sensors are such elements of industrial automation that work by interrupting the light beam sent from the sensor. This light beam is reflected back from the reflector. So the reflection sensors use visible and invisible light (most often infrared but also ultraviolet), ordinary and laser. One of the simplest variants is an optical reflective sensor that uses an infrared LED. Additionally, they are paired with phototransistors. The phototransistor is connected to the supply voltage source through a resistor forming a voltage divider. It is worth to mention that at the output of this divider a voltage of 0V to typically 5V is obtained as a representation of the IR reflection, with the lower value representing a stronger IR reflection.
In terms of electrical voltage issues, the way the sensors work is easy to understand. The analogue output of the sensor, while supplying the received voltage, can be connected for further reading in various ways. How to do it? The simplest technique is to connect the sensor output to the analog input of the ADC on the microcontroller or to the binary input using a software comparator. The second option is to connect the sensor to a hardware comparator with an adjustable logic change threshold (LM393 integrated circuit). A two-state microcontroller is required for reading. While new reflection sensors now work through infrared and LEDs, there was once an incandescent or discharge (UV) light source.
Types of reflection sensors
There are plenty of reflection sensors that might be used in various projects. Some devices are used to build robots and DIY Internet of Things projects, while others are used in industrial automation (production lines).
Reflective sensors is a name that covers a whole group of different devices. They work similarly, but you can see differences based on how the returned light is used. In this respect, we can distinguish between classic distance sensors, color sensors, contrast sensors and surface smoothness sensors (also known as gloss sensors; gloss meters).
The sensors shown here can be implemented in different places. Due to the small dimensions of the sensors, they can be easily connected in parallel in the form of a bar, which allows easy detection of edges, walls and other obstacles, including the possibility of measuring the distance from them.
Measurement accuracy of reflection sensors
Laser and optoelectronic sensors have very good measurement accuracy and are well suited for many hobby and advanced projects. To get the best possible sensor accuracy, perform a calibration first. Calibrating a proximity sensor is an important process as there are no ideal sensors and, despite the repeatable production technology, two identical sensors can output different voltage values. The method of calibration also affects the accuracy of the measurement. In many cases, it is worth choosing programming. These steps will be very simple if you are also using Arduino. The presented sensors are compatible with various programmable electronics components.
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